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v1.5.51

v1.5.51: Squashed commit of the following:
@xtaci xtaci tagged this 24 Jan 14:29 
commit c8a401fdb45dee2399df5ca30955637ddec96b41
Author: xtaci <imap@live.com>
Date:   Sat Jan 24 22:29:03 2026 +0800

    fix(session): reject cmdUPD in protocol version 1

    cmdUPD is a v2-only command used for flow control window updates.
    Previously, recvLoop would accept and process cmdUPD even when
    the session was configured for protocol version 1, which violates
    the protocol specification.

    This change adds a version check before processing cmdUPD. If the
    session is not running v2, it now correctly returns ErrInvalidProtocol
    and terminates the receive loop.
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